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linux/drivers/media/video/uvc/uvc_driver.c
Laurent Pinchart 8e113595ed V4L/DVB (12379): uvcvideo: Multiple streaming interfaces support 
Restructure the UVC descriptors parsing code to handle multiple streaming
interfaces. The driver now creates a uvc_video_chain instance for each chain
detected in the UVC control interface descriptors, and tries to register one
video device per streaming endpoint.

Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2009-09-12 12:18:33 -03:00

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/*
* uvc_driver.c -- USB Video Class driver
*
* Copyright (C) 2005-2009
* Laurent Pinchart (laurent.pinchart@skynet.be)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
/*
* This driver aims to support video input and ouput devices compliant with the
* 'USB Video Class' specification.
*
* The driver doesn't support the deprecated v4l1 interface. It implements the
* mmap capture method only, and doesn't do any image format conversion in
* software. If your user-space application doesn't support YUYV or MJPEG, fix
* it :-). Please note that the MJPEG data have been stripped from their
* Huffman tables (DHT marker), you will need to add it back if your JPEG
* codec can't handle MJPEG data.
*/
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/videodev2.h>
#include <linux/vmalloc.h>
#include <linux/wait.h>
#include <asm/atomic.h>
#include <asm/unaligned.h>
#include <media/v4l2-common.h>
#include "uvcvideo.h"
#define DRIVER_AUTHOR "Laurent Pinchart <laurent.pinchart@skynet.be>"
#define DRIVER_DESC "USB Video Class driver"
#ifndef DRIVER_VERSION
#define DRIVER_VERSION "v0.1.0"
#endif
unsigned int uvc_no_drop_param;
static unsigned int uvc_quirks_param;
unsigned int uvc_trace_param;
/* ------------------------------------------------------------------------
* Video formats
*/
static struct uvc_format_desc uvc_fmts[] = {
{
.name = "YUV 4:2:2 (YUYV)",
.guid = UVC_GUID_FORMAT_YUY2,
.fcc = V4L2_PIX_FMT_YUYV,
},
{
.name = "YUV 4:2:0 (NV12)",
.guid = UVC_GUID_FORMAT_NV12,
.fcc = V4L2_PIX_FMT_NV12,
},
{
.name = "MJPEG",
.guid = UVC_GUID_FORMAT_MJPEG,
.fcc = V4L2_PIX_FMT_MJPEG,
},
{
.name = "YVU 4:2:0 (YV12)",
.guid = UVC_GUID_FORMAT_YV12,
.fcc = V4L2_PIX_FMT_YVU420,
},
{
.name = "YUV 4:2:0 (I420)",
.guid = UVC_GUID_FORMAT_I420,
.fcc = V4L2_PIX_FMT_YUV420,
},
{
.name = "YUV 4:2:2 (UYVY)",
.guid = UVC_GUID_FORMAT_UYVY,
.fcc = V4L2_PIX_FMT_UYVY,
},
{
.name = "Greyscale",
.guid = UVC_GUID_FORMAT_Y800,
.fcc = V4L2_PIX_FMT_GREY,
},
{
.name = "RGB Bayer",
.guid = UVC_GUID_FORMAT_BY8,
.fcc = V4L2_PIX_FMT_SBGGR8,
},
};
/* ------------------------------------------------------------------------
* Utility functions
*/
struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
__u8 epaddr)
{
struct usb_host_endpoint *ep;
unsigned int i;
for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
ep = &alts->endpoint[i];
if (ep->desc.bEndpointAddress == epaddr)
return ep;
}
return NULL;
}
static struct uvc_format_desc *uvc_format_by_guid(const __u8 guid[16])
{
unsigned int len = ARRAY_SIZE(uvc_fmts);
unsigned int i;
for (i = 0; i < len; ++i) {
if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
return &uvc_fmts[i];
}
return NULL;
}
static __u32 uvc_colorspace(const __u8 primaries)
{
static const __u8 colorprimaries[] = {
0,
V4L2_COLORSPACE_SRGB,
V4L2_COLORSPACE_470_SYSTEM_M,
V4L2_COLORSPACE_470_SYSTEM_BG,
V4L2_COLORSPACE_SMPTE170M,
V4L2_COLORSPACE_SMPTE240M,
};
if (primaries < ARRAY_SIZE(colorprimaries))
return colorprimaries[primaries];
return 0;
}
/* Simplify a fraction using a simple continued fraction decomposition. The
* idea here is to convert fractions such as 333333/10000000 to 1/30 using
* 32 bit arithmetic only. The algorithm is not perfect and relies upon two
* arbitrary parameters to remove non-significative terms from the simple
* continued fraction decomposition. Using 8 and 333 for n_terms and threshold
* respectively seems to give nice results.
*/
void uvc_simplify_fraction(uint32_t *numerator, uint32_t *denominator,
unsigned int n_terms, unsigned int threshold)
{
uint32_t *an;
uint32_t x, y, r;
unsigned int i, n;
an = kmalloc(n_terms * sizeof *an, GFP_KERNEL);
if (an == NULL)
return;
/* Convert the fraction to a simple continued fraction. See
* http://mathforum.org/dr.math/faq/faq.fractions.html
* Stop if the current term is bigger than or equal to the given
* threshold.
*/
x = *numerator;
y = *denominator;
for (n = 0; n < n_terms && y != 0; ++n) {
an[n] = x / y;
if (an[n] >= threshold) {
if (n < 2)
n++;
break;
}
r = x - an[n] * y;
x = y;
y = r;
}
/* Expand the simple continued fraction back to an integer fraction. */
x = 0;
y = 1;
for (i = n; i > 0; --i) {
r = y;
y = an[i-1] * y + x;
x = r;
}
*numerator = y;
*denominator = x;
kfree(an);
}
/* Convert a fraction to a frame interval in 100ns multiples. The idea here is
* to compute numerator / denominator * 10000000 using 32 bit fixed point
* arithmetic only.
*/
uint32_t uvc_fraction_to_interval(uint32_t numerator, uint32_t denominator)
{
uint32_t multiplier;
/* Saturate the result if the operation would overflow. */
if (denominator == 0 ||
numerator/denominator >= ((uint32_t)-1)/10000000)
return (uint32_t)-1;
/* Divide both the denominator and the multiplier by two until
* numerator * multiplier doesn't overflow. If anyone knows a better
* algorithm please let me know.
*/
multiplier = 10000000;
while (numerator > ((uint32_t)-1)/multiplier) {
multiplier /= 2;
denominator /= 2;
}
return denominator ? numerator * multiplier / denominator : 0;
}
/* ------------------------------------------------------------------------
* Terminal and unit management
*/
static struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
{
struct uvc_entity *entity;
list_for_each_entry(entity, &dev->entities, list) {
if (entity->id == id)
return entity;
}
return NULL;
}
static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
int id, struct uvc_entity *entity)
{
unsigned int i;
if (entity == NULL)
entity = list_entry(&dev->entities, struct uvc_entity, list);
list_for_each_entry_continue(entity, &dev->entities, list) {
switch (UVC_ENTITY_TYPE(entity)) {
case UVC_TT_STREAMING:
if (entity->output.bSourceID == id)
return entity;
break;
case UVC_VC_PROCESSING_UNIT:
if (entity->processing.bSourceID == id)
return entity;
break;
case UVC_VC_SELECTOR_UNIT:
for (i = 0; i < entity->selector.bNrInPins; ++i)
if (entity->selector.baSourceID[i] == id)
return entity;
break;
case UVC_VC_EXTENSION_UNIT:
for (i = 0; i < entity->extension.bNrInPins; ++i)
if (entity->extension.baSourceID[i] == id)
return entity;
break;
}
}
return NULL;
}
static struct uvc_streaming *uvc_stream_by_id(struct uvc_device *dev, int id)
{
struct uvc_streaming *stream;
list_for_each_entry(stream, &dev->streams, list) {
if (stream->header.bTerminalLink == id)
return stream;
}
return NULL;
}
/* ------------------------------------------------------------------------
* Descriptors parsing
*/
static int uvc_parse_format(struct uvc_device *dev,
struct uvc_streaming *streaming, struct uvc_format *format,
__u32 **intervals, unsigned char *buffer, int buflen)
{
struct usb_interface *intf = streaming->intf;
struct usb_host_interface *alts = intf->cur_altsetting;
struct uvc_format_desc *fmtdesc;
struct uvc_frame *frame;
const unsigned char *start = buffer;
unsigned int interval;
unsigned int i, n;
__u8 ftype;
format->type = buffer[2];
format->index = buffer[3];
switch (buffer[2]) {
case UVC_VS_FORMAT_UNCOMPRESSED:
case UVC_VS_FORMAT_FRAME_BASED:
n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
if (buflen < n) {
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
"interface %d FORMAT error\n",
dev->udev->devnum,
alts->desc.bInterfaceNumber);
return -EINVAL;
}
/* Find the format descriptor from its GUID. */
fmtdesc = uvc_format_by_guid(&buffer[5]);
if (fmtdesc != NULL) {
strlcpy(format->name, fmtdesc->name,
sizeof format->name);
format->fcc = fmtdesc->fcc;
} else {
uvc_printk(KERN_INFO, "Unknown video format "
UVC_GUID_FORMAT "\n",
UVC_GUID_ARGS(&buffer[5]));
snprintf(format->name, sizeof format->name,
UVC_GUID_FORMAT, UVC_GUID_ARGS(&buffer[5]));
format->fcc = 0;
}
format->bpp = buffer[21];
if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
ftype = UVC_VS_FRAME_UNCOMPRESSED;
} else {
ftype = UVC_VS_FRAME_FRAME_BASED;
if (buffer[27])
format->flags = UVC_FMT_FLAG_COMPRESSED;
}
break;
case UVC_VS_FORMAT_MJPEG:
if (buflen < 11) {
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
"interface %d FORMAT error\n",
dev->udev->devnum,
alts->desc.bInterfaceNumber);
return -EINVAL;
}
strlcpy(format->name, "MJPEG", sizeof format->name);
format->fcc = V4L2_PIX_FMT_MJPEG;
format->flags = UVC_FMT_FLAG_COMPRESSED;
format->bpp = 0;
ftype = UVC_VS_FRAME_MJPEG;
break;
case UVC_VS_FORMAT_DV:
if (buflen < 9) {
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
"interface %d FORMAT error\n",
dev->udev->devnum,
alts->desc.bInterfaceNumber);
return -EINVAL;
}
switch (buffer[8] & 0x7f) {
case 0:
strlcpy(format->name, "SD-DV", sizeof format->name);
break;
case 1:
strlcpy(format->name, "SDL-DV", sizeof format->name);
break;
case 2:
strlcpy(format->name, "HD-DV", sizeof format->name);
break;
default:
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
"interface %d: unknown DV format %u\n",
dev->udev->devnum,
alts->desc.bInterfaceNumber, buffer[8]);
return -EINVAL;
}
strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
sizeof format->name);
format->fcc = V4L2_PIX_FMT_DV;
format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
format->bpp = 0;
ftype = 0;
/* Create a dummy frame descriptor. */
frame = &format->frame[0];
memset(&format->frame[0], 0, sizeof format->frame[0]);
frame->bFrameIntervalType = 1;
frame->dwDefaultFrameInterval = 1;
frame->dwFrameInterval = *intervals;
*(*intervals)++ = 1;
format->nframes = 1;
break;
case UVC_VS_FORMAT_MPEG2TS:
case UVC_VS_FORMAT_STREAM_BASED:
/* Not supported yet. */
default:
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
"interface %d unsupported format %u\n",
dev->udev->devnum, alts->desc.bInterfaceNumber,
buffer[2]);
return -EINVAL;
}
uvc_trace(UVC_TRACE_DESCR, "Found format %s.\n", format->name);
buflen -= buffer[0];
buffer += buffer[0];
/* Parse the frame descriptors. Only uncompressed, MJPEG and frame
* based formats have frame descriptors.
*/
while (buflen > 2 && buffer[2] == ftype) {
frame = &format->frame[format->nframes];
if (ftype != UVC_VS_FRAME_FRAME_BASED)
n = buflen > 25 ? buffer[25] : 0;
else
n = buflen > 21 ? buffer[21] : 0;
n = n ? n : 3;
if (buflen < 26 + 4*n) {
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
"interface %d FRAME error\n", dev->udev->devnum,
alts->desc.bInterfaceNumber);
return -EINVAL;
}
frame->bFrameIndex = buffer[3];
frame->bmCapabilities = buffer[4];
frame->wWidth = get_unaligned_le16(&buffer[5]);
frame->wHeight = get_unaligned_le16(&buffer[7]);
frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
if (ftype != UVC_VS_FRAME_FRAME_BASED) {
frame->dwMaxVideoFrameBufferSize =
get_unaligned_le32(&buffer[17]);
frame->dwDefaultFrameInterval =
get_unaligned_le32(&buffer[21]);
frame->bFrameIntervalType = buffer[25];
} else {
frame->dwMaxVideoFrameBufferSize = 0;
frame->dwDefaultFrameInterval =
get_unaligned_le32(&buffer[17]);
frame->bFrameIntervalType = buffer[21];
}
frame->dwFrameInterval = *intervals;
/* Several UVC chipsets screw up dwMaxVideoFrameBufferSize
* completely. Observed behaviours range from setting the
* value to 1.1x the actual frame size to hardwiring the
* 16 low bits to 0. This results in a higher than necessary
* memory usage as well as a wrong image size information. For
* uncompressed formats this can be fixed by computing the
* value from the frame size.
*/
if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
frame->dwMaxVideoFrameBufferSize = format->bpp
* frame->wWidth * frame->wHeight / 8;
/* Some bogus devices report dwMinFrameInterval equal to
* dwMaxFrameInterval and have dwFrameIntervalStep set to
* zero. Setting all null intervals to 1 fixes the problem and
* some other divisions by zero that could happen.
*/
for (i = 0; i < n; ++i) {
interval = get_unaligned_le32(&buffer[26+4*i]);
*(*intervals)++ = interval ? interval : 1;
}
/* Make sure that the default frame interval stays between
* the boundaries.
*/
n -= frame->bFrameIntervalType ? 1 : 2;
frame->dwDefaultFrameInterval =
min(frame->dwFrameInterval[n],
max(frame->dwFrameInterval[0],
frame->dwDefaultFrameInterval));
uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
frame->wWidth, frame->wHeight,
10000000/frame->dwDefaultFrameInterval,
(100000000/frame->dwDefaultFrameInterval)%10);
format->nframes++;
buflen -= buffer[0];
buffer += buffer[0];
}
if (buflen > 2 && buffer[2] == UVC_VS_STILL_IMAGE_FRAME) {
buflen -= buffer[0];
buffer += buffer[0];
}
if (buflen > 2 && buffer[2] == UVC_VS_COLORFORMAT) {
if (buflen < 6) {
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
"interface %d COLORFORMAT error\n",
dev->udev->devnum,
alts->desc.bInterfaceNumber);
return -EINVAL;
}
format->colorspace = uvc_colorspace(buffer[3]);
buflen -= buffer[0];
buffer += buffer[0];
}
return buffer - start;
}
static int uvc_parse_streaming(struct uvc_device *dev,
struct usb_interface *intf)
{
struct uvc_streaming *streaming = NULL;
struct uvc_format *format;
struct uvc_frame *frame;
struct usb_host_interface *alts = &intf->altsetting[0];
unsigned char *_buffer, *buffer = alts->extra;
int _buflen, buflen = alts->extralen;
unsigned int nformats = 0, nframes = 0, nintervals = 0;
unsigned int size, i, n, p;
__u32 *interval;
__u16 psize;
int ret = -EINVAL;
if (intf->cur_altsetting->desc.bInterfaceSubClass
!= UVC_SC_VIDEOSTREAMING) {
uvc_trace(UVC_TRACE_DESCR, "device %d interface %d isn't a "
"video streaming interface\n", dev->udev->devnum,
intf->altsetting[0].desc.bInterfaceNumber);
return -EINVAL;
}
if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
uvc_trace(UVC_TRACE_DESCR, "device %d interface %d is already "
"claimed\n", dev->udev->devnum,
intf->altsetting[0].desc.bInterfaceNumber);
return -EINVAL;
}
streaming = kzalloc(sizeof *streaming, GFP_KERNEL);
if (streaming == NULL) {
usb_driver_release_interface(&uvc_driver.driver, intf);
return -EINVAL;
}
mutex_init(&streaming->mutex);
streaming->dev = dev;
streaming->intf = usb_get_intf(intf);
streaming->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
/* The Pico iMage webcam has its class-specific interface descriptors
* after the endpoint descriptors.
*/
if (buflen == 0) {
for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
struct usb_host_endpoint *ep = &alts->endpoint[i];
if (ep->extralen == 0)
continue;
if (ep->extralen > 2 &&
ep->extra[1] == USB_DT_CS_INTERFACE) {
uvc_trace(UVC_TRACE_DESCR, "trying extra data "
"from endpoint %u.\n", i);
buffer = alts->endpoint[i].extra;
buflen = alts->endpoint[i].extralen;
break;
}
}
}
/* Skip the standard interface descriptors. */
while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
buflen -= buffer[0];
buffer += buffer[0];
}
if (buflen <= 2) {
uvc_trace(UVC_TRACE_DESCR, "no class-specific streaming "
"interface descriptors found.\n");
goto error;
}
/* Parse the header descriptor. */
switch (buffer[2]) {
case UVC_VS_OUTPUT_HEADER:
streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
size = 9;
break;
case UVC_VS_INPUT_HEADER:
streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
size = 13;
break;
default:
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
"%d HEADER descriptor not found.\n", dev->udev->devnum,
alts->desc.bInterfaceNumber);
goto error;
}
p = buflen >= 4 ? buffer[3] : 0;
n = buflen >= size ? buffer[size-1] : 0;
if (buflen < size + p*n) {
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
"interface %d HEADER descriptor is invalid.\n",
dev->udev->devnum, alts->desc.bInterfaceNumber);
goto error;
}
streaming->header.bNumFormats = p;
streaming->header.bEndpointAddress = buffer[6];
if (buffer[2] == UVC_VS_INPUT_HEADER) {
streaming->header.bmInfo = buffer[7];
streaming->header.bTerminalLink = buffer[8];
streaming->header.bStillCaptureMethod = buffer[9];
streaming->header.bTriggerSupport = buffer[10];
streaming->header.bTriggerUsage = buffer[11];
} else {
streaming->header.bTerminalLink = buffer[7];
}
streaming->header.bControlSize = n;
streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL);
if (streaming->header.bmaControls == NULL) {
ret = -ENOMEM;
goto error;
}
memcpy(streaming->header.bmaControls, &buffer[size], p*n);
buflen -= buffer[0];
buffer += buffer[0];
_buffer = buffer;
_buflen = buflen;
/* Count the format and frame descriptors. */
while (_buflen > 2 && _buffer[1] == USB_DT_CS_INTERFACE) {
switch (_buffer[2]) {
case UVC_VS_FORMAT_UNCOMPRESSED:
case UVC_VS_FORMAT_MJPEG:
case UVC_VS_FORMAT_FRAME_BASED:
nformats++;
break;
case UVC_VS_FORMAT_DV:
/* DV format has no frame descriptor. We will create a
* dummy frame descriptor with a dummy frame interval.
*/
nformats++;
nframes++;
nintervals++;
break;
case UVC_VS_FORMAT_MPEG2TS:
case UVC_VS_FORMAT_STREAM_BASED:
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
"interface %d FORMAT %u is not supported.\n",
dev->udev->devnum,
alts->desc.bInterfaceNumber, _buffer[2]);
break;
case UVC_VS_FRAME_UNCOMPRESSED:
case UVC_VS_FRAME_MJPEG:
nframes++;
if (_buflen > 25)
nintervals += _buffer[25] ? _buffer[25] : 3;
break;
case UVC_VS_FRAME_FRAME_BASED:
nframes++;
if (_buflen > 21)
nintervals += _buffer[21] ? _buffer[21] : 3;
break;
}
_buflen -= _buffer[0];
_buffer += _buffer[0];
}
if (nformats == 0) {
uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface "
"%d has no supported formats defined.\n",
dev->udev->devnum, alts->desc.bInterfaceNumber);
goto error;
}
size = nformats * sizeof *format + nframes * sizeof *frame
+ nintervals * sizeof *interval;
format = kzalloc(size, GFP_KERNEL);
if (format == NULL) {
ret = -ENOMEM;
goto error;
}
frame = (struct uvc_frame *)&format[nformats];
interval = (__u32 *)&frame[nframes];
streaming->format = format;
streaming->nformats = nformats;
/* Parse the format descriptors. */
while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
switch (buffer[2]) {
case UVC_VS_FORMAT_UNCOMPRESSED:
case UVC_VS_FORMAT_MJPEG:
case UVC_VS_FORMAT_DV:
case UVC_VS_FORMAT_FRAME_BASED:
format->frame = frame;
ret = uvc_parse_format(dev, streaming, format,
&interval, buffer, buflen);
if (ret < 0)
goto error;
frame += format->nframes;
format++;
buflen -= ret;
buffer += ret;
continue;
default:
break;
}
buflen -= buffer[0];
buffer += buffer[0];
}
/* Parse the alternate settings to find the maximum bandwidth. */
for (i = 0; i < intf->num_altsetting; ++i) {
struct usb_host_endpoint *ep;
alts = &intf->altsetting[i];
ep = uvc_find_endpoint(alts,
streaming->header.bEndpointAddress);
if (ep == NULL)
continue;
psize = le16_to_cpu(ep->desc.wMaxPacketSize);
psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
if (psize > streaming->maxpsize)
streaming->maxpsize = psize;
}
list_add_tail(&streaming->list, &dev->streams);
return 0;
error:
usb_driver_release_interface(&uvc_driver.driver, intf);
usb_put_intf(intf);
kfree(streaming->format);
kfree(streaming->header.bmaControls);
kfree(streaming);
return ret;
}
/* Parse vendor-specific extensions. */
static int uvc_parse_vendor_control(struct uvc_device *dev,
const unsigned char *buffer, int buflen)
{
struct usb_device *udev = dev->udev;
struct usb_host_interface *alts = dev->intf->cur_altsetting;
struct uvc_entity *unit;
unsigned int n, p;
int handled = 0;
switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
case 0x046d: /* Logitech */
if (buffer[1] != 0x41 || buffer[2] != 0x01)
break;
/* Logitech implements several vendor specific functions
* through vendor specific extension units (LXU).
*
* The LXU descriptors are similar to XU descriptors
* (see "USB Device Video Class for Video Devices", section
* 3.7.2.6 "Extension Unit Descriptor") with the following
* differences:
*
* ----------------------------------------------------------
* 0 bLength 1 Number
* Size of this descriptor, in bytes: 24+p+n*2
* ----------------------------------------------------------
* 23+p+n bmControlsType N Bitmap
* Individual bits in the set are defined:
* 0: Absolute
* 1: Relative
*
* This bitset is mapped exactly the same as bmControls.
* ----------------------------------------------------------
* 23+p+n*2 bReserved 1 Boolean
* ----------------------------------------------------------
* 24+p+n*2 iExtension 1 Index
* Index of a string descriptor that describes this
* extension unit.
* ----------------------------------------------------------
*/
p = buflen >= 22 ? buffer[21] : 0;
n = buflen >= 25 + p ? buffer[22+p] : 0;
if (buflen < 25 + p + 2*n) {
uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
"interface %d EXTENSION_UNIT error\n",
udev->devnum, alts->desc.bInterfaceNumber);
break;
}
unit = kzalloc(sizeof *unit + p + 2*n, GFP_KERNEL);
if (unit == NULL)
return -ENOMEM;
unit->id = buffer[3];
unit->type = UVC_VC_EXTENSION_UNIT;
memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
unit->extension.bNumControls = buffer[20];
unit->extension.bNrInPins = get_unaligned_le16(&buffer[21]);
unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
memcpy(unit->extension.baSourceID, &buffer[22], p);
unit->extension.bControlSize = buffer[22+p];
unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
unit->extension.bmControlsType = (__u8 *)unit + sizeof *unit
+ p + n;
memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
if (buffer[24+p+2*n] != 0)
usb_string(udev, buffer[24+p+2*n], unit->name,
sizeof unit->name);
else
sprintf(unit->name, "Extension %u", buffer[3]);
list_add_tail(&unit->list, &dev->entities);
handled = 1;
break;
}
return handled;
}
static int uvc_parse_standard_control(struct uvc_device *dev,
const unsigned char *buffer, int buflen)
{
struct usb_device *udev = dev->udev;
struct uvc_entity *unit, *term;
struct usb_interface *intf;
struct usb_host_interface *alts = dev->intf->cur_altsetting;
unsigned int i, n, p, len;
__u16 type;
switch (buffer[2]) {
case UVC_VC_HEADER:
n = buflen >= 12 ? buffer[11] : 0;
if (buflen < 12 || buflen < 12 + n) {
uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
"interface %d HEADER error\n", udev->devnum,
alts->desc.bInterfaceNumber);
return -EINVAL;
}
dev->uvc_version = get_unaligned_le16(&buffer[3]);
dev->clock_frequency = get_unaligned_le32(&buffer[7]);
/* Parse all USB Video Streaming interfaces. */
for (i = 0; i < n; ++i) {
intf = usb_ifnum_to_if(udev, buffer[12+i]);
if (intf == NULL) {
uvc_trace(UVC_TRACE_DESCR, "device %d "
"interface %d doesn't exists\n",
udev->devnum, i);
continue;
}
uvc_parse_streaming(dev, intf);
}
break;
case UVC_VC_INPUT_TERMINAL:
if (buflen < 8) {
uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
"interface %d INPUT_TERMINAL error\n",
udev->devnum, alts->desc.bInterfaceNumber);
return -EINVAL;
}
/* Make sure the terminal type MSB is not null, otherwise it
* could be confused with a unit.
*/
type = get_unaligned_le16(&buffer[4]);
if ((type & 0xff00) == 0) {
uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
"interface %d INPUT_TERMINAL %d has invalid "
"type 0x%04x, skipping\n", udev->devnum,
alts->desc.bInterfaceNumber,
buffer[3], type);
return 0;
}
n = 0;
p = 0;
len = 8;
if (type == UVC_ITT_CAMERA) {
n = buflen >= 15 ? buffer[14] : 0;
len = 15;
} else if (type == UVC_ITT_MEDIA_TRANSPORT_INPUT) {
n = buflen >= 9 ? buffer[8] : 0;
p = buflen >= 10 + n ? buffer[9+n] : 0;
len = 10;
}
if (buflen < len + n + p) {
uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
"interface %d INPUT_TERMINAL error\n",
udev->devnum, alts->desc.bInterfaceNumber);
return -EINVAL;
}
term = kzalloc(sizeof *term + n + p, GFP_KERNEL);
if (term == NULL)
return -ENOMEM;
term->id = buffer[3];
term->type = type | UVC_TERM_INPUT;
if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
term->camera.bControlSize = n;
term->camera.bmControls = (__u8 *)term + sizeof *term;
term->camera.wObjectiveFocalLengthMin =
get_unaligned_le16(&buffer[8]);
term->camera.wObjectiveFocalLengthMax =
get_unaligned_le16(&buffer[10]);
term->camera.wOcularFocalLength =
get_unaligned_le16(&buffer[12]);
memcpy(term->camera.bmControls, &buffer[15], n);
} else if (UVC_ENTITY_TYPE(term) ==
UVC_ITT_MEDIA_TRANSPORT_INPUT) {
term->media.bControlSize = n;
term->media.bmControls = (__u8 *)term + sizeof *term;
term->media.bTransportModeSize = p;
term->media.bmTransportModes = (__u8 *)term
+ sizeof *term + n;
memcpy(term->media.bmControls, &buffer[9], n);
memcpy(term->media.bmTransportModes, &buffer[10+n], p);
}
if (buffer[7] != 0)
usb_string(udev, buffer[7], term->name,
sizeof term->name);
else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
sprintf(term->name, "Camera %u", buffer[3]);
else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
sprintf(term->name, "Media %u", buffer[3]);
else
sprintf(term->name, "Input %u", buffer[3]);
list_add_tail(&term->list, &dev->entities);
break;
case UVC_VC_OUTPUT_TERMINAL:
if (buflen < 9) {
uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
"interface %d OUTPUT_TERMINAL error\n",
udev->devnum, alts->desc.bInterfaceNumber);
return -EINVAL;
}
/* Make sure the terminal type MSB is not null, otherwise it
* could be confused with a unit.
*/
type = get_unaligned_le16(&buffer[4]);
if ((type & 0xff00) == 0) {
uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
"interface %d OUTPUT_TERMINAL %d has invalid "
"type 0x%04x, skipping\n", udev->devnum,
alts->desc.bInterfaceNumber, buffer[3], type);
return 0;
}
term = kzalloc(sizeof *term, GFP_KERNEL);
if (term == NULL)
return -ENOMEM;
term->id = buffer[3];
term->type = type | UVC_TERM_OUTPUT;
term->output.bSourceID = buffer[7];
if (buffer[8] != 0)
usb_string(udev, buffer[8], term->name,
sizeof term->name);
else
sprintf(term->name, "Output %u", buffer[3]);
list_add_tail(&term->list, &dev->entities);
break;
case UVC_VC_SELECTOR_UNIT:
p = buflen >= 5 ? buffer[4] : 0;
if (buflen < 5 || buflen < 6 + p) {
uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
"interface %d SELECTOR_UNIT error\n",
udev->devnum, alts->desc.bInterfaceNumber);
return -EINVAL;
}
unit = kzalloc(sizeof *unit + p, GFP_KERNEL);
if (unit == NULL)
return -ENOMEM;
unit->id = buffer[3];
unit->type = buffer[2];
unit->selector.bNrInPins = buffer[4];
unit->selector.baSourceID = (__u8 *)unit + sizeof *unit;
memcpy(unit->selector.baSourceID, &buffer[5], p);
if (buffer[5+p] != 0)
usb_string(udev, buffer[5+p], unit->name,
sizeof unit->name);
else
sprintf(unit->name, "Selector %u", buffer[3]);
list_add_tail(&unit->list, &dev->entities);
break;
case UVC_VC_PROCESSING_UNIT:
n = buflen >= 8 ? buffer[7] : 0;
p = dev->uvc_version >= 0x0110 ? 10 : 9;
if (buflen < p + n) {
uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
"interface %d PROCESSING_UNIT error\n",
udev->devnum, alts->desc.bInterfaceNumber);
return -EINVAL;
}
unit = kzalloc(sizeof *unit + n, GFP_KERNEL);
if (unit == NULL)
return -ENOMEM;
unit->id = buffer[3];
unit->type = buffer[2];
unit->processing.bSourceID = buffer[4];
unit->processing.wMaxMultiplier =
get_unaligned_le16(&buffer[5]);
unit->processing.bControlSize = buffer[7];
unit->processing.bmControls = (__u8 *)unit + sizeof *unit;
memcpy(unit->processing.bmControls, &buffer[8], n);
if (dev->uvc_version >= 0x0110)
unit->processing.bmVideoStandards = buffer[9+n];
if (buffer[8+n] != 0)
usb_string(udev, buffer[8+n], unit->name,
sizeof unit->name);
else
sprintf(unit->name, "Processing %u", buffer[3]);
list_add_tail(&unit->list, &dev->entities);
break;
case UVC_VC_EXTENSION_UNIT:
p = buflen >= 22 ? buffer[21] : 0;
n = buflen >= 24 + p ? buffer[22+p] : 0;
if (buflen < 24 + p + n) {
uvc_trace(UVC_TRACE_DESCR, "device %d videocontrol "
"interface %d EXTENSION_UNIT error\n",
udev->devnum, alts->desc.bInterfaceNumber);
return -EINVAL;
}
unit = kzalloc(sizeof *unit + p + n, GFP_KERNEL);
if (unit == NULL)
return -ENOMEM;
unit->id = buffer[3];
unit->type = buffer[2];
memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
unit->extension.bNumControls = buffer[20];
unit->extension.bNrInPins = get_unaligned_le16(&buffer[21]);
unit->extension.baSourceID = (__u8 *)unit + sizeof *unit;
memcpy(unit->extension.baSourceID, &buffer[22], p);
unit->extension.bControlSize = buffer[22+p];
unit->extension.bmControls = (__u8 *)unit + sizeof *unit + p;
memcpy(unit->extension.bmControls, &buffer[23+p], n);
if (buffer[23+p+n] != 0)
usb_string(udev, buffer[23+p+n], unit->name,
sizeof unit->name);
else
sprintf(unit->name, "Extension %u", buffer[3]);
list_add_tail(&unit->list, &dev->entities);
break;
default:
uvc_trace(UVC_TRACE_DESCR, "Found an unknown CS_INTERFACE "
"descriptor (%u)\n", buffer[2]);
break;
}
return 0;
}
static int uvc_parse_control(struct uvc_device *dev)
{
struct usb_host_interface *alts = dev->intf->cur_altsetting;
unsigned char *buffer = alts->extra;
int buflen = alts->extralen;
int ret;
/* Parse the default alternate setting only, as the UVC specification
* defines a single alternate setting, the default alternate setting
* zero.
*/
while (buflen > 2) {
if (uvc_parse_vendor_control(dev, buffer, buflen) ||
buffer[1] != USB_DT_CS_INTERFACE)
goto next_descriptor;
if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
return ret;
next_descriptor:
buflen -= buffer[0];
buffer += buffer[0];
}
/* Check if the optional status endpoint is present. Built-in iSight
* webcams have an interrupt endpoint but spit proprietary data that
* don't conform to the UVC status endpoint messages. Don't try to
* handle the interrupt endpoint for those cameras.
*/
if (alts->desc.bNumEndpoints == 1 &&
!(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
struct usb_host_endpoint *ep = &alts->endpoint[0];
struct usb_endpoint_descriptor *desc = &ep->desc;
if (usb_endpoint_is_int_in(desc) &&
le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
desc->bInterval != 0) {
uvc_trace(UVC_TRACE_DESCR, "Found a Status endpoint "
"(addr %02x).\n", desc->bEndpointAddress);
dev->int_ep = ep;
}
}
return 0;
}
/* ------------------------------------------------------------------------
* UVC device scan
*/
/*
* Scan the UVC descriptors to locate a chain starting at an Output Terminal
* and containing the following units:
*
* - one or more Output Terminals (USB Streaming or Display)
* - zero or one Processing Unit
* - zero, one or more single-input Selector Units
* - zero or one multiple-input Selector Units, provided all inputs are
* connected to input terminals
* - zero, one or mode single-input Extension Units
* - one or more Input Terminals (Camera, External or USB Streaming)
*
* The terminal and units must match on of the following structures:
*
* ITT_*(0) -> +---------+ +---------+ +---------+ -> TT_STREAMING(0)
* ... | SU{0,1} | -> | PU{0,1} | -> | XU{0,n} | ...
* ITT_*(n) -> +---------+ +---------+ +---------+ -> TT_STREAMING(n)
*
* +---------+ +---------+ -> OTT_*(0)
* TT_STREAMING -> | PU{0,1} | -> | XU{0,n} | ...
* +---------+ +---------+ -> OTT_*(n)
*
* The Processing Unit and Extension Units can be in any order. Additional
* Extension Units connected to the main chain as single-unit branches are
* also supported. Single-input Selector Units are ignored.
*/
static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
struct uvc_entity *entity)
{
switch (UVC_ENTITY_TYPE(entity)) {
case UVC_VC_EXTENSION_UNIT:
if (uvc_trace_param & UVC_TRACE_PROBE)
printk(" <- XU %d", entity->id);
if (entity->extension.bNrInPins != 1) {
uvc_trace(UVC_TRACE_DESCR, "Extension unit %d has more "
"than 1 input pin.\n", entity->id);
return -1;
}
list_add_tail(&entity->chain, &chain->extensions);
break;
case UVC_VC_PROCESSING_UNIT:
if (uvc_trace_param & UVC_TRACE_PROBE)
printk(" <- PU %d", entity->id);
if (chain->processing != NULL) {
uvc_trace(UVC_TRACE_DESCR, "Found multiple "
"Processing Units in chain.\n");
return -1;
}
chain->processing = entity;
break;
case UVC_VC_SELECTOR_UNIT:
if (uvc_trace_param & UVC_TRACE_PROBE)
printk(" <- SU %d", entity->id);
/* Single-input selector units are ignored. */
if (entity->selector.bNrInPins == 1)
break;
if (chain->selector != NULL) {
uvc_trace(UVC_TRACE_DESCR, "Found multiple Selector "
"Units in chain.\n");
return -1;
}
chain->selector = entity;
break;
case UVC_ITT_VENDOR_SPECIFIC:
case UVC_ITT_CAMERA:
case UVC_ITT_MEDIA_TRANSPORT_INPUT:
if (uvc_trace_param & UVC_TRACE_PROBE)
printk(" <- IT %d\n", entity->id);
list_add_tail(&entity->chain, &chain->iterms);
break;
case UVC_TT_STREAMING:
if (uvc_trace_param & UVC_TRACE_PROBE)
printk(" <- IT %d\n", entity->id);
if (!UVC_ENTITY_IS_ITERM(entity)) {
uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
"terminal %u.\n", entity->id);
return -1;
}
list_add_tail(&entity->chain, &chain->iterms);
break;
default:
uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type "
"0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity));
return -1;
}
return 0;
}
static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
struct uvc_entity *entity, struct uvc_entity *prev)
{
struct uvc_entity *forward;
int found;
/* Forward scan */
forward = NULL;
found = 0;
while (1) {
forward = uvc_entity_by_reference(chain->dev, entity->id,
forward);
if (forward == NULL)
break;
if (forward == prev)
continue;
switch (UVC_ENTITY_TYPE(forward)) {
case UVC_VC_EXTENSION_UNIT:
if (forward->extension.bNrInPins != 1) {
uvc_trace(UVC_TRACE_DESCR, "Extension unit %d "
"has more than 1 input pin.\n",
entity->id);
return -EINVAL;
}
list_add_tail(&forward->chain, &chain->extensions);
if (uvc_trace_param & UVC_TRACE_PROBE) {
if (!found)
printk(" (->");
printk(" XU %d", forward->id);
found = 1;
}
break;
case UVC_OTT_VENDOR_SPECIFIC:
case UVC_OTT_DISPLAY:
case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
case UVC_TT_STREAMING:
if (UVC_ENTITY_IS_ITERM(forward)) {
uvc_trace(UVC_TRACE_DESCR, "Unsupported input "
"terminal %u.\n", forward->id);
return -EINVAL;
}
list_add_tail(&forward->chain, &chain->oterms);
if (uvc_trace_param & UVC_TRACE_PROBE) {
if (!found)
printk(" (->");
printk(" OT %d", forward->id);
found = 1;
}
break;
}
}
if (found)
printk(")");
return 0;
}
static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
struct uvc_entity *entity)
{
struct uvc_entity *term;
int id = -1, i;
switch (UVC_ENTITY_TYPE(entity)) {
case UVC_VC_EXTENSION_UNIT:
id = entity->extension.baSourceID[0];
break;
case UVC_VC_PROCESSING_UNIT:
id = entity->processing.bSourceID;
break;
case UVC_VC_SELECTOR_UNIT:
/* Single-input selector units are ignored. */
if (entity->selector.bNrInPins == 1) {
id = entity->selector.baSourceID[0];
break;
}
if (uvc_trace_param & UVC_TRACE_PROBE)
printk(" <- IT");
chain->selector = entity;
for (i = 0; i < entity->selector.bNrInPins; ++i) {
id = entity->selector.baSourceID[i];
term = uvc_entity_by_id(chain->dev, id);
if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
uvc_trace(UVC_TRACE_DESCR, "Selector unit %d "
"input %d isn't connected to an "
"input terminal\n", entity->id, i);
return -1;
}
if (uvc_trace_param & UVC_TRACE_PROBE)
printk(" %d", term->id);
list_add_tail(&term->chain, &chain->iterms);
uvc_scan_chain_forward(chain, term, entity);
}
if (uvc_trace_param & UVC_TRACE_PROBE)
printk("\n");
id = 0;
break;
}
return id;
}
static int uvc_scan_chain(struct uvc_video_chain *chain,
struct uvc_entity *oterm)
{
struct uvc_entity *entity, *prev;
int id;
entity = oterm;
list_add_tail(&entity->chain, &chain->oterms);
uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain: OT %d", entity->id);
id = entity->output.bSourceID;
while (id != 0) {
prev = entity;
entity = uvc_entity_by_id(chain->dev, id);
if (entity == NULL) {
uvc_trace(UVC_TRACE_DESCR, "Found reference to "
"unknown entity %d.\n", id);
return -EINVAL;
}
if (entity->chain.next || entity->chain.prev) {
uvc_trace(UVC_TRACE_DESCR, "Found reference to "
"entity %d already in chain.\n", id);
return -EINVAL;
}
/* Process entity */
if (uvc_scan_chain_entity(chain, entity) < 0)
return -EINVAL;
/* Forward scan */
if (uvc_scan_chain_forward(chain, entity, prev) < 0)
return -EINVAL;
/* Stop when a terminal is found. */
if (UVC_ENTITY_IS_TERM(entity))
break;
/* Backward scan */
id = uvc_scan_chain_backward(chain, entity);
if (id < 0)
return id;
}
return 0;
}
static unsigned int uvc_print_terms(struct list_head *terms, char *buffer)
{
struct uvc_entity *term;
unsigned int nterms = 0;
char *p = buffer;
list_for_each_entry(term, terms, chain) {
p += sprintf(p, "%u", term->id);
if (term->chain.next != terms) {
p += sprintf(p, ",");
if (++nterms >= 4) {
p += sprintf(p, "...");
break;
}
}
}
return p - buffer;
}
static const char *uvc_print_chain(struct uvc_video_chain *chain)
{
static char buffer[43];
char *p = buffer;
p += uvc_print_terms(&chain->iterms, p);
p += sprintf(p, " -> ");
uvc_print_terms(&chain->oterms, p);
return buffer;
}
/*
* Scan the device for video chains and register video devices.
*
* Chains are scanned starting at their output terminals and walked backwards.
*/
static int uvc_scan_device(struct uvc_device *dev)
{
struct uvc_video_chain *chain;
struct uvc_entity *term;
list_for_each_entry(term, &dev->entities, list) {
if (!UVC_ENTITY_IS_OTERM(term))
continue;
/* If the terminal is already included in a chain, skip it.
* This can happen for chains that have multiple output
* terminals, where all output terminals beside the first one
* will be inserted in the chain in forward scans.
*/
if (term->chain.next || term->chain.prev)
continue;
chain = kzalloc(sizeof(*chain), GFP_KERNEL);
if (chain == NULL)
return -ENOMEM;
INIT_LIST_HEAD(&chain->iterms);
INIT_LIST_HEAD(&chain->oterms);
INIT_LIST_HEAD(&chain->extensions);
mutex_init(&chain->ctrl_mutex);
chain->dev = dev;
if (uvc_scan_chain(chain, term) < 0) {
kfree(chain);
continue;
}
uvc_trace(UVC_TRACE_PROBE, "Found a valid video chain (%s).\n",
uvc_print_chain(chain));
list_add_tail(&chain->list, &dev->chains);
}
if (list_empty(&dev->chains)) {
uvc_printk(KERN_INFO, "No valid video chain found.\n");
return -1;
}
return 0;
}
/* ------------------------------------------------------------------------
* Video device registration and unregistration
*/
/*
* Unregister the video devices.
*/
static void uvc_unregister_video(struct uvc_device *dev)
{
struct uvc_streaming *stream;
list_for_each_entry(stream, &dev->streams, list) {
if (stream->vdev == NULL)
continue;
if (stream->vdev->minor == -1)
video_device_release(stream->vdev);
else
video_unregister_device(stream->vdev);
stream->vdev = NULL;
}
}
static int uvc_register_video(struct uvc_device *dev,
struct uvc_streaming *stream)
{
struct video_device *vdev;
int ret;
/* Initialize the streaming interface with default streaming
* parameters.
*/
ret = uvc_video_init(stream);
if (ret < 0) {
uvc_printk(KERN_ERR, "Failed to initialize the device "
"(%d).\n", ret);
return ret;
}
/* Register the device with V4L. */
vdev = video_device_alloc();
if (vdev == NULL) {
uvc_printk(KERN_ERR, "Failed to allocate video device (%d).\n",
ret);
return -ENOMEM;
}
/* We already hold a reference to dev->udev. The video device will be
* unregistered before the reference is released, so we don't need to
* get another one.
*/
vdev->parent = &dev->intf->dev;
vdev->minor = -1;
vdev->fops = &uvc_fops;
vdev->release = video_device_release;
strlcpy(vdev->name, dev->name, sizeof vdev->name);
/* Set the driver data before calling video_register_device, otherwise
* uvc_v4l2_open might race us.
*/
stream->vdev = vdev;
video_set_drvdata(vdev, stream);
ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
if (ret < 0) {
uvc_printk(KERN_ERR, "Failed to register video device (%d).\n",
ret);
stream->vdev = NULL;
video_device_release(vdev);
return ret;
}
return 0;
}
/*
* Register all video devices in all chains.
*/
static int uvc_register_terms(struct uvc_device *dev,
struct uvc_video_chain *chain, struct list_head *terms)
{
struct uvc_streaming *stream;
struct uvc_entity *term;
int ret;
list_for_each_entry(term, terms, chain) {
if (UVC_ENTITY_TYPE(term) != UVC_TT_STREAMING)
continue;
stream = uvc_stream_by_id(dev, term->id);
if (stream == NULL) {
uvc_printk(KERN_INFO, "No streaming interface found "
"for terminal %u.", term->id);
continue;
}
stream->chain = chain;
ret = uvc_register_video(dev, stream);
if (ret < 0)
return ret;
}
return 0;
}
static int uvc_register_chains(struct uvc_device *dev)
{
struct uvc_video_chain *chain;
int ret;
list_for_each_entry(chain, &dev->chains, list) {
ret = uvc_register_terms(dev, chain, &chain->iterms);
if (ret < 0)
return ret;
ret = uvc_register_terms(dev, chain, &chain->oterms);
if (ret < 0)
return ret;
}
return 0;
}
/* ------------------------------------------------------------------------
* USB probe, disconnect, suspend and resume
*/
/*
* Delete the UVC device.
*
* Called by the kernel when the last reference to the uvc_device structure
* is released.
*
* Unregistering the video devices is done here because every opened instance
* must be closed before the device can be unregistered. An alternative would
* have been to use another reference count for uvc_v4l2_open/uvc_release, and
* unregister the video devices on disconnect when that reference count drops
* to zero.
*
* As this function is called after or during disconnect(), all URBs have
* already been canceled by the USB core. There is no need to kill the
* interrupt URB manually.
*/
void uvc_delete(struct kref *kref)
{
struct uvc_device *dev = container_of(kref, struct uvc_device, kref);
struct list_head *p, *n;
/* Unregister the video devices. */
uvc_unregister_video(dev);
usb_put_intf(dev->intf);
usb_put_dev(dev->udev);
uvc_status_cleanup(dev);
uvc_ctrl_cleanup_device(dev);
list_for_each_safe(p, n, &dev->chains) {
struct uvc_video_chain *chain;
chain = list_entry(p, struct uvc_video_chain, list);
kfree(chain);
}
list_for_each_safe(p, n, &dev->entities) {
struct uvc_entity *entity;
entity = list_entry(p, struct uvc_entity, list);
kfree(entity);
}
list_for_each_safe(p, n, &dev->streams) {
struct uvc_streaming *streaming;
streaming = list_entry(p, struct uvc_streaming, list);
usb_driver_release_interface(&uvc_driver.driver,
streaming->intf);
usb_put_intf(streaming->intf);
kfree(streaming->format);
kfree(streaming->header.bmaControls);
kfree(streaming);
}
kfree(dev);
}
static int uvc_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct uvc_device *dev;
int ret;
if (id->idVendor && id->idProduct)
uvc_trace(UVC_TRACE_PROBE, "Probing known UVC device %s "
"(%04x:%04x)\n", udev->devpath, id->idVendor,
id->idProduct);
else
uvc_trace(UVC_TRACE_PROBE, "Probing generic UVC device %s\n",
udev->devpath);
/* Allocate memory for the device and initialize it. */
if ((dev = kzalloc(sizeof *dev, GFP_KERNEL)) == NULL)
return -ENOMEM;
INIT_LIST_HEAD(&dev->entities);
INIT_LIST_HEAD(&dev->chains);
INIT_LIST_HEAD(&dev->streams);
kref_init(&dev->kref);
atomic_set(&dev->users, 0);
dev->udev = usb_get_dev(udev);
dev->intf = usb_get_intf(intf);
dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
dev->quirks = id->driver_info | uvc_quirks_param;
if (udev->product != NULL)
strlcpy(dev->name, udev->product, sizeof dev->name);
else
snprintf(dev->name, sizeof dev->name,
"UVC Camera (%04x:%04x)",
le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct));
/* Parse the Video Class control descriptor. */
if (uvc_parse_control(dev) < 0) {
uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
"descriptors.\n");
goto error;
}
uvc_printk(KERN_INFO, "Found UVC %u.%02x device %s (%04x:%04x)\n",
dev->uvc_version >> 8, dev->uvc_version & 0xff,
udev->product ? udev->product : "<unnamed>",
le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct));
if (uvc_quirks_param != 0) {
uvc_printk(KERN_INFO, "Forcing device quirks 0x%x by module "
"parameter for testing purpose.\n", uvc_quirks_param);
uvc_printk(KERN_INFO, "Please report required quirks to the "
"linux-uvc-devel mailing list.\n");
}
/* Initialize controls. */
if (uvc_ctrl_init_device(dev) < 0)
goto error;
/* Scan the device for video chains. */
if (uvc_scan_device(dev) < 0)
goto error;
/* Register video devices. */
if (uvc_register_chains(dev) < 0)
goto error;
/* Save our data pointer in the interface data. */
usb_set_intfdata(intf, dev);
/* Initialize the interrupt URB. */
if ((ret = uvc_status_init(dev)) < 0) {
uvc_printk(KERN_INFO, "Unable to initialize the status "
"endpoint (%d), status interrupt will not be "
"supported.\n", ret);
}
uvc_trace(UVC_TRACE_PROBE, "UVC device initialized.\n");
return 0;
error:
kref_put(&dev->kref, uvc_delete);
return -ENODEV;
}
static void uvc_disconnect(struct usb_interface *intf)
{
struct uvc_device *dev = usb_get_intfdata(intf);
/* Set the USB interface data to NULL. This can be done outside the
* lock, as there's no other reader.
*/
usb_set_intfdata(intf, NULL);
if (intf->cur_altsetting->desc.bInterfaceSubClass ==
UVC_SC_VIDEOSTREAMING)
return;
/* uvc_v4l2_open() might race uvc_disconnect(). A static driver-wide
* lock is needed to prevent uvc_disconnect from releasing its
* reference to the uvc_device instance after uvc_v4l2_open() received
* the pointer to the device (video_devdata) but before it got the
* chance to increase the reference count (kref_get).
*
* Note that the reference can't be released with the lock held,
* otherwise a AB-BA deadlock can occur with videodev_lock that
* videodev acquires in videodev_open() and video_unregister_device().
*/
mutex_lock(&uvc_driver.open_mutex);
dev->state |= UVC_DEV_DISCONNECTED;
mutex_unlock(&uvc_driver.open_mutex);
kref_put(&dev->kref, uvc_delete);
}
static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
{
struct uvc_device *dev = usb_get_intfdata(intf);
struct uvc_streaming *stream;
uvc_trace(UVC_TRACE_SUSPEND, "Suspending interface %u\n",
intf->cur_altsetting->desc.bInterfaceNumber);
/* Controls are cached on the fly so they don't need to be saved. */
if (intf->cur_altsetting->desc.bInterfaceSubClass ==
UVC_SC_VIDEOCONTROL)
return uvc_status_suspend(dev);
list_for_each_entry(stream, &dev->streams, list) {
if (stream->intf == intf)
return uvc_video_suspend(stream);
}
uvc_trace(UVC_TRACE_SUSPEND, "Suspend: video streaming USB interface "
"mismatch.\n");
return -EINVAL;
}
static int __uvc_resume(struct usb_interface *intf, int reset)
{
struct uvc_device *dev = usb_get_intfdata(intf);
struct uvc_streaming *stream;
uvc_trace(UVC_TRACE_SUSPEND, "Resuming interface %u\n",
intf->cur_altsetting->desc.bInterfaceNumber);
if (intf->cur_altsetting->desc.bInterfaceSubClass ==
UVC_SC_VIDEOCONTROL) {
if (reset) {
int ret = uvc_ctrl_resume_device(dev);
if (ret < 0)
return ret;
}
return uvc_status_resume(dev);
}
list_for_each_entry(stream, &dev->streams, list) {
if (stream->intf == intf)
return uvc_video_resume(stream);
}
uvc_trace(UVC_TRACE_SUSPEND, "Resume: video streaming USB interface "
"mismatch.\n");
return -EINVAL;
}
static int uvc_resume(struct usb_interface *intf)
{
return __uvc_resume(intf, 0);
}
static int uvc_reset_resume(struct usb_interface *intf)
{
return __uvc_resume(intf, 1);
}
/* ------------------------------------------------------------------------
* Driver initialization and cleanup
*/
/*
* The Logitech cameras listed below have their interface class set to
* VENDOR_SPEC because they don't announce themselves as UVC devices, even
* though they are compliant.
*/
static struct usb_device_id uvc_ids[] = {
/* Microsoft Lifecam NX-6000 */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x045e,
.idProduct = 0x00f8,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_PROBE_MINMAX },
/* Microsoft Lifecam VX-7000 */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x045e,
.idProduct = 0x0723,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_PROBE_MINMAX },
/* Logitech Quickcam Fusion */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x046d,
.idProduct = 0x08c1,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0 },
/* Logitech Quickcam Orbit MP */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x046d,
.idProduct = 0x08c2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0 },
/* Logitech Quickcam Pro for Notebook */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x046d,
.idProduct = 0x08c3,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0 },
/* Logitech Quickcam Pro 5000 */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x046d,
.idProduct = 0x08c5,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0 },
/* Logitech Quickcam OEM Dell Notebook */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x046d,
.idProduct = 0x08c6,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0 },
/* Logitech Quickcam OEM Cisco VT Camera II */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x046d,
.idProduct = 0x08c7,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0 },
/* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x058f,
.idProduct = 0x3820,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_PROBE_MINMAX },
/* Apple Built-In iSight */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x05ac,
.idProduct = 0x8501,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_PROBE_MINMAX
| UVC_QUIRK_BUILTIN_ISIGHT },
/* Genesys Logic USB 2.0 PC Camera */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x05e3,
.idProduct = 0x0505,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_STREAM_NO_FID },
/* ViMicro Vega */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x0ac8,
.idProduct = 0x332d,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_FIX_BANDWIDTH },
/* ViMicro - Minoru3D */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x0ac8,
.idProduct = 0x3410,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_FIX_BANDWIDTH },
/* ViMicro Venus - Minoru3D */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x0ac8,
.idProduct = 0x3420,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_FIX_BANDWIDTH },
/* MT6227 */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x0e8d,
.idProduct = 0x0004,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_PROBE_MINMAX
| UVC_QUIRK_PROBE_DEF },
/* Syntek (HP Spartan) */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x174f,
.idProduct = 0x5212,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_STREAM_NO_FID },
/* Syntek (Samsung Q310) */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x174f,
.idProduct = 0x5931,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_STREAM_NO_FID },
/* Syntek (Asus F9SG) */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x174f,
.idProduct = 0x8a31,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_STREAM_NO_FID },
/* Syntek (Asus U3S) */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x174f,
.idProduct = 0x8a33,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_STREAM_NO_FID },
/* Syntek (JAOtech Smart Terminal) */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x174f,
.idProduct = 0x8a34,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_STREAM_NO_FID },
/* Lenovo Thinkpad SL400/SL500 */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x17ef,
.idProduct = 0x480b,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_STREAM_NO_FID },
/* Aveo Technology USB 2.0 Camera */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x1871,
.idProduct = 0x0306,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_PROBE_MINMAX
| UVC_QUIRK_PROBE_EXTRAFIELDS },
/* Ecamm Pico iMage */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x18cd,
.idProduct = 0xcafe,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_PROBE_EXTRAFIELDS },
/* FSC WebCam V30S */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x18ec,
.idProduct = 0x3288,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_PROBE_MINMAX },
/* Bodelin ProScopeHR */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_DEV_HI
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x19ab,
.idProduct = 0x1000,
.bcdDevice_hi = 0x0126,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_STATUS_INTERVAL },
/* SiGma Micro USB Web Camera */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x1c4f,
.idProduct = 0x3000,
.bInterfaceClass = USB_CLASS_VIDEO,
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_PROBE_MINMAX
| UVC_QUIRK_IGNORE_SELECTOR_UNIT },
/* Generic USB Video Class */
{ USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
{}
};
MODULE_DEVICE_TABLE(usb, uvc_ids);
struct uvc_driver uvc_driver = {
.driver = {
.name = "uvcvideo",
.probe = uvc_probe,
.disconnect = uvc_disconnect,
.suspend = uvc_suspend,
.resume = uvc_resume,
.reset_resume = uvc_reset_resume,
.id_table = uvc_ids,
.supports_autosuspend = 1,
},
};
static int __init uvc_init(void)
{
int result;
INIT_LIST_HEAD(&uvc_driver.devices);
INIT_LIST_HEAD(&uvc_driver.controls);
mutex_init(&uvc_driver.open_mutex);
mutex_init(&uvc_driver.ctrl_mutex);
uvc_ctrl_init();
result = usb_register(&uvc_driver.driver);
if (result == 0)
printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n");
return result;
}
static void __exit uvc_cleanup(void)
{
usb_deregister(&uvc_driver.driver);
}
module_init(uvc_init);
module_exit(uvc_cleanup);
module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(quirks, "Forced device quirks");
module_param_named(trace, uvc_trace_param, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(trace, "Trace level bitmask");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);
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